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With summer here, it's important to know the dangers of high temperatures. Heat stroke can be dangerous. Here are some ways you can identify heat stroke and what you should do when you see some of its symptoms. (Published Tuesday, July 18, 2017)

Experts say the temperature inside of the tractor-trailer where smuggled immigrants died and many others were left in dire health would have quickly become unbearable in the Texas heat.

Authorities said they found more than three dozen people, including eight who were dead, in the truck's trailer after an employee at the San Antonio Walmart where it was parked overnight called the police. One later died at a hospital. San Antonio Fire Chief Charles Hood said Saturday that the trailer didn't have a working air conditioning system and the victims "were very hot to the touch."

Thomas Homan, acting director of U.S. Immigration and Customs Enforcement, told The Associated Press that based on initial interviews with survivors, there may have been more than 100 people in the truck at one point, including some who were picked up by other vehicles or who fled.

This and other tragic instances of human smuggling, including a 2003 case in Victoria, Texas, in which 19 immigrants died, highlight the dangers that extreme heat poses to would-be immigrants.

Alabama Candidates Cast Their Ballots

Republican Roy Moore, facing numerous allegations of sexual misconduct with teenage girls, and Democrat Doug Jones cast their ballots in the vote that will send one of them to the U.S. Senate. NBC's Chris Pollone reports.

(Published Tuesday, Dec. 12, 2017)

TREACHEROUS TRAILERWith a high of 101 degrees (38 Celsius) in San Antonio on Saturday, the temperature inside a parked car would have reached 120 degrees (49 Celsius) in 10 minutes, said Jan Null, a meteorology professor at San Jose State University who tracks U.S. child deaths in vehicles on his website, www.NoHeatStroke.org. Within 20 minutes, the temperature would have risen to 130 degrees (54 Celsius).

The lack of windows on the trailer in San Antonio may have reduced the temperature inside by a couple degrees because of the lack of direct sunlight, but the heat and moisture from the bodies of everyone inside would have added heat and humidity.

Enduring those temperatures for any length of time is dangerous, said Dr. Eric Ernest, assistant professor of emergency medicine at University of Nebraska Medical Center in Omaha.